Q.1

Which of the following statement is true about brittle fracture?

  • High temperature and low strain rates favour brittle fracture
  • Many metals with hexagonal close packed (H.C.P) crystal structure commonly show brittle fracture
  • Brittle fracture is always preceded by noise
  • Cup and cone formation is characteristic for brittle materials
Q.2

In flame hardening, oxy-acetylene flame is used.

  • Yes
  • No
Q.3

An aluminium alloy withsilicon is used for making engine pistons by die casting technique.

  • Yes
  • No
Q.4

Malleable cast iron is produced

  • by adding magnesium to molten cast iron
  • by quick cooling of molten cast iron
  • from white cast iron by annealing process
  • none of these
Q.5

The heat treatment process used for softening hardened steel is

  • carburising
  • normalising
  • annealing
  • tempering
Q.6

A small percentage of boron is added to steel in order to

  • increase hardenability
  • reduce machinability
  • increase wear resistance
  • increase endurance strength
Q.7

The aluminium alloy made by melting aluminium with 2 tomagnesium and 1.copper is called

  • duralumin
  • Y-alloy
  • magnalium
  • hindalium
Q.8

An alloy of copper, tin and zinc is known as

  • brass
  • bronze
  • gun metal
  • muntz metal
Q.9

The hardness and tensile strength in austenitic stainless steel can be increased by

  • hardening and cold working
  • normalising
  • martempering
  • full annealing
Q.10

The lower critical temperature

  • decreases as the carbon content in steel increases
  • increases as the carbon content in steel increases
  • is same for all steels
  • depends upon the rate of heating
Q.11

White cast iron has a high tensile strength and a low compressive strength.

  • Yes
  • No
Q.12

Pearlite consists of

  • 13% carbon and 87% ferrite
  • 13% cementite and 87% ferrite
  • 13% ferrite and 87% cementite
  • 6.67% carbon and 93.33% iron
Q.13

The steel produced by bessemer or open hearth process is __________ to that produced by L-D process.

  • superior
  • inferior
Q.14

Which of the following metal shrinks most from molten state to solid state?

  • Cast iron
  • Cast steel
  • Brass
  • Admirality metal
Q.15

Y-alloy contains

  • 3.5 to 4.5% copper, 0.4 to 0.7% magnesium, 0.4 to 0.7% manganese and rest aluminium
  • 3.5 to 4.5% copper, 1.2 to 1.7% manganese, 1.8 to 2.3% nickel, 0.6% each of silicon, magnesium and iron, and rest aluminium
  • 4 to 4.5% magnesium, 3 to 4% copper and rest aluminium
  • 5 to 6% tin, 2 to 3% copper and rest aluminium
Q.16

The coordination number of a face centred cubic space lattice is

  • six
  • twelve
  • eighteen
  • twenty
Q.17

Which of the following iron exist betweenC andC?

  • α-iron
  • β-iron
  • γ-iron
  • δ-iron
Q.18

Shock resistance of steel is increased by adding

  • nickel
  • chromium
  • nickel and chromium
  • sulphur, lead and phosphorus
Q.19

Which of the following material has nearly zero coefficient of expansion?

  • Stainless steel
  • High speed steel
  • Invar
  • Heat resisting steel
Q.20

The blade of a power saw is made of

  • boron steel
  • high speed steel
  • stainless steel
  • malleable cast iron
Q.21

When a low carbon steel is heated upto upper critical temperature

  • there is no change in grain size
  • the average grain size is a minimum
  • the grain size increases very rapidly
  • the grain size first increases and then decreases very rapidly
Q.22

Grey cast iron has

  • carbon in the form of free graphite
  • high tensile strength
  • low compressive strength
  • all of these
Q.23

Which of the following statements are true for annealing of steels?

  • Steels are heated to 500 to 700° C
  • Cooling is done slowly and steadily
  • Internal stresses are relieved
  • all of these
Q.24

Which of the following is an amorphous material?

  • Mica
  • Silver
  • Lead
  • Glass
Q.25

The machinability of steel is improved by adding

  • nickel
  • chromium
  • nickel and chromium
  • sulphur, lead and phosphorus
Q.26

Smelting is the process of

  • removing the impurities like clay, sand etc. from the iron ore by washing with water
  • expelling moisture, carbon dioxide, sulphur and arsenic from the iron ore by heating in shallow kilns
  • reducing the ore with carbon in the presence of a flux
  • all of the above
Q.27

The dieing down of a white flame during the operation of a bessemer converter indicates that the air is burning out silicon and manganese.

  • Yes
  • No
Q.28

Which of the following process of steel making is in operation at Tata Iron and Steel Works, Jamshedpur?

  • Bessemer process
  • Open hearth process
  • Duplex process
  • Electric process
Q.29

Incoloy, Hastelloy and Vitallium are __________ temperature alloys.

  • high
  • low
Q.30

Quenching is not necessary when hardening is done by

  • case hardening
  • flame hardening
  • nitriding
  • any one of these
Q.31

Crystal structure of a material is, generally, examined by

  • naked eye
  • optical microscope
  • metallurgical microscope
  • X-ray techniques
Q.32

A steel containing ferrite and pearlite is

  • hard
  • soft
  • tough
  • hard and tough
Q.33

The steel scrap added in the charge of cupola controls the grade of cast iron produced.

  • Correct
  • Incorrect
Q.34

Spheroidal grey cast iron has graphite flakes.

  • True
  • False
Q.35

Bronze is an alloy of

  • copper and zinc
  • copper and tin
  • copper, tin and zinc
  • none of these
Q.36

The material in which the atoms are arranged chaotically, is called

  • amorphous material
  • mesomorphous material
  • crystalline material
  • none of these
Q.37

In low carbon steels, __________ raises the yield point and improves the resistance to atmospheric corrosion.

  • sulphur
  • phosphorus
  • manganese
  • silicon
Q.38

In normalising process, the hypo-eutectiod steel is heated fromC toC above the upper critical temperature and then cooled in still air.

  • True
  • False
Q.39

The alloying element which can replace tungsten in high speed steels is

  • nickel
  • vanadium
  • cobalt
  • molybdenum
Q.40

In induction hardening __________ is high.

  • current
  • voltage
  • frequency
  • temperature
Q.41

The steel widely used for motor car crankshafts is

  • nickel steel
  • chrome steel
  • nickel-chrome steel
  • silicon steel
Q.42

Induction hardening is basically a

  • carburising process
  • surface hardening process
  • core-hardening process
  • none of these
Q.43

The ability of a material to undergo large permanent deformation with the application of a tensile force, is called ductility.

  • Correct
  • Incorrect
Q.44

The carbon in the pig iron varies from

  • 0.1 to 0.5%
  • 0.5 to 1%
  • 1 to 5%
  • 5 to 10%
Q.45

The percentage of carbon in cast iron varies from

  • 0.1 to 0.5
  • 0.5 to 1
  • 1 to 1.7
  • 1.7 to 4.5
Q.46

The electric process of steel making is especially adopted to

  • alloy and carbon tool steel
  • magnet steel
  • high speed tool steel
  • all of these
Q.47

The unit cells

  • contain the smallest number of atoms which when taken together have all the properties of the crystals of the particular metal
  • have the same orientation and their similar faces are parallel
  • may be defined as the smallest parallelopiped which could be transposed in three coordinate directions to build up the space lattice
  • all of the above
Q.48

The iron ore in the charge of blast furnace acts as an iron bearing mineral.

  • True
  • False
Q.49

Iron-carbon alloys containing 1.7 to 4.carbon are known as

  • eutectic cast irons
  • hypo-eutectic cast irons
  • hyper-eutectic cast irons
  • none of these
Q.50

The defect which takes place due to imperfect packing of atoms during crystallisation is known as

  • line defect
  • surface defect
  • point defect
  • none of these
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